Young's double slit experiment

In Young's famous experiment he fired electrons through a barrier
with two narrow slits and detected them on a screen on the far side.
You might have expected that most of the electrons would cluster
around the centre of the screen; however, you would be wrong!
There is a strong central band, and then bands where no electrons
appear and then more strong bands further away from the centre. To
understand this we need a different understanding of the
electron...